Why am i so small?

I'm 15 years old and I'm really short, and not to mention flat chested. Other than that I'm basically a normal teen. I dont really care about the boobs. It the fact that people are constantly mistaking me for a 12 year old. Can someone explain why. And...

some tips to make me look my age?

I like watermelon :D

makeup, n dress older and you cant rely do anything bout your size or flat chest, sorry. im small skinny and 14 and I dont worry about it, I dont think you should either x

Put on more makeup like eyeliner
Talk bout 15 year old stuff
Act like 15 year old
There is really no way to grow
Just wear more makeup and act like 15 year old

I had the same thing with me and hated how young I looked because I'm very short and my body is also very petite. I'm 18 now and people still think I'm a few years younger than I am like they think I'm 14. Best you can do is dress a little older. Not much to do trust me I tried.

everyones biological clock is different

Same here.. I'm 18 and constantly mistaken for 14. people are taken back when they find out my age.. Nothing I've done has worked for me..
all I can recommend is maybe ask your friends to go shopping with you and ask them to help you out.. Try experimenting with different make-up.. and maybe a bra that has some padding to it..

heyy so im only 13, but a year ago my doctor told me I was very petite for my age and I was and he thought I was bearly going to make it to 5 feet. now im 5'4'' 1/2 so if I were you I would really give it some time because just randomly had a growth spirt these past few months

Everybody has different growing patterns. You just might get a growth spurt later than other people. Its perfectly normal and just a natural way of your body saying I need more time.